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公开(公告)号：JPH04306395A
公开(公告)日：1992-10-29
申请号：JP34145091
申请日：1991-12-24
Applicant: CONOCO INC
Inventor： UIRIAMU EMU BENTSUINGU
Abstract: PURPOSE: To surely detect a fracture by rotating a downhole orbital vibrator provided with two orthogonal motion sensors and an azimuth detector after lowering the vibrator in a borehole and displaying the outputs of the sensors as a Lissajou figure. CONSTITUTION: After a downhole logging device 12 is lowered to a desired depth in a borehole, the azimuths of two underground sound detectors arranged on an orbital source 24 are measured by an azimuth instrument 30. In addition, the phase angle between the sound detectors is measured by rotationally driving the source 24. The source 24 is continuously and increasingly rotated at the same depth by a motor 22 and measures both the phase angle and azimuths or bearings. The outputs of the two vertical underground sound detectors are displayed as a Lissajou figure and, when the figure forms an elliptical shape, the presence of an underground fracture is recognized.
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